Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6bbf93b11215c2e…

MALICIOUS

PDF

69.1 KB Created: 2021-09-25 14:23:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e3b67f7bbf995a38fdb6cbd1cbb74328 SHA-1: 0922d397b34e7a2553a9d0f4968c6118b7024735 SHA-256: e6bbf93b11215c2e36bce42aead3da1902ab5bd533a0fa6e4e6e0f908308e862
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of external links, many pointing to disposable domains, suggesting a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://topupdana.com/contents/files/renimuxo.pdf In PDF document text
    • http://leton.pl/userfiles/file/rejepasuburaxebuzagel.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/74005794603.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/tofonibubafakadizowesad.pdfIn PDF document text
    • https://aletihad-group.com/userfiles/files/gumija.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/kikovojexad.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/fc488d6c42e76f42362c5df8b8c1d59f/79163121686.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/jafixapetovukike.pdfIn PDF document text
    • https://redac.ch/upload/9004234190.pdfIn PDF document text
    • https://jdrum-music.com/uploads/ckfiles/files/23110764097.pdfIn PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/78328254844.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/ludijasogus.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/21675618354.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1614bd14d379d0---63300359230.pdfIn PDF document text
    • https://adikmanis.com/contents/files/xedubufemilefu.pdfIn PDF document text
    • http://all-vehicle.net/js/upload/files/fojoxibolejuwopuda.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/17302307329.pdfIn PDF document text
    • http://jn-zhsc.com/upload/81513934129.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/49333154431.pdfIn PDF document text
    • https://chorland-dining.com/webroot/editor-uploads/files/31663077457.pdfIn PDF document text
    • http://mislenyiallatorvos.hu/userfiles/file/90771960814.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=hd+anime+wallpaper+for+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF55 15780 bytes
SHA-256: 9ef7bca8719535f164b0bc0fd62d0d24ba187cd5682e1af98f90f87993766896
font_01_sfnt_off0000d75a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF71 10468 bytes
SHA-256: a7963ec1983ebf7dc9288bf080ac2fa5cdc193d3f35f3c5767525a65aa78c37c

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